.header-fixed{
    position: fixed;
    left: 0;
    right: 0;
    z-index: var(--header-z-index);
}

.header>.auto-center{
    display: flex;
    justify-content: space-between;
}

.header .logo{
    width: 92px;
    height: 36px;
    background: url("../images/logofanbai.png") center / contain no-repeat;
}

.header .nav{
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 16px;
}

.header .nav>.nav-item {
    position: relative;
    display: flex;
    align-items: center;
    margin-left: 46px;
}

.header .arrow-down {
    margin-left:9px;
}

.header .mask {
    position: absolute;
    top:30px;
    left:-20px;
    width:100px;
    max-height:0;
    display:flex;
    flex-direction: column;
    background-color: rgba(0,0,0,.5);
    transition: all 0.5s linear;
    overflow:hidden;
}

.header .nav>.nav-item:hover .mask {
    max-height:500px;
}

.header {
    padding: 22px 0;
}

.header .mask>a{
    text-align: center;
    padding: 10px;
}

.header-white .mask>a{
    color:#fff;
}

.header-white .mask>a:hover {
    color: var(--header-white-hover);
}

.header-white {
    background-color: #fff;
}

.header-white a {
    color:#333;
}

.header-white a:hover{
    color: var(--header-white-hover);
}

.header-white .logo {
    background-image: url("../images/logo.png");
}